RS232_RXD/TXD on daughtercard interface

GNU Radio
1

Hi all,
A while back I noticed there are two signals called RS232_RXD and
RS232_TXD exposed on the PMC connector going to the daughtercard slots
on the USRP. Tracing these back on the USRP schematic, they go to the
Cypress EZUSB chip. I searched around a bit but didn’t find any
reference to any daughtercard using these, nor did grep find any
reference to these in the 3.2.2 release of GNUradio. Is there any way
to send/receive UART data to these lines from within GNUradio? If
not, what was the intent with these lines?

Thanks much…

–
Regards,
John O.
CEO/System Architect
Epiq Solutions

2

On 01/19/2010 09:41 AM, John O. wrote:

Thanks much…

Those have never been used. The original intention was to use it as a
UART. The USRP2 does not connect to those pins, so it’s not a good idea
to use them.

Matt

3

On Tue, Jan 19, 2010 at 11:55 AM, Matt E. [email protected] wrote:

not, what was the intent with these lines?

Thanks much…

Those have never been used. The original intention was to use it as a UART.
The USRP2 does not connect to those pins, so it’s not a good idea to use
them.

Gotcha…as always, thanks for the quick reply Matt!

–
Regards,
John O.
CEO/System Architect
Epiq Solutions